Running back is one of the more high-profile positions on the field. Alabama’s Mark Ingram, for example, won the Heisman Trophy this past season, but he just finished his sophomore season, so he’s not in this year’s draft.

This year’s crop has not exactly spurred a national discussion about who’s the best, etc., because what remains on the board is a class full of situational players with just a few every-down prospects.

Leading the way this year are Clemson’s C.J. Spiller and Fresno State’s Ryan Mathews.

Spiller has game-altering speed — a 4.37-second 40-yard dash on the electronic clock at the scouting combine — with good enough vision in traffic to have returned an NCAA-record seven kickoffs for touchdowns in his career.

Spiller was a three-time All-American in track for Clemson and had 21 career touchdown plays of at least 50 yards, numbers that constitute phenomenal big-play potential as a receiver, runner and returner.

And those are the three R’s NFL offensive coaches really like to study.

Mathews exploded for 1,808 yards rushing this past season after gaining 866 and 606 yards in his first two seasons with the Bulldogs.

After being slowed by a knee injury — he had some nerve damage after a lineman stepped on his leg — he missed five games and parts of three others in 2008.

But this past season, Mathews showed speed and big-play ability. His effort against Boise State’s defense was the kind that gets a player a first-round grade.

Against a top-10 defense — Boise State was No. 5 in the nation at the time — Mathews rushed for 234 yards and had three runs of at least 60 yards. He finished the year averaging 6.6 yards per carry.

After those two players, things get muddled with either bigger backs who don’t have much speed or fast, smaller backs who look like part-time players.

There is Stanford’s Toby Gerhart, a 231-pounder with solid 4.5 speed, whom the Broncos and others teams have brought in for a visit in recent weeks. Gerhart is a full-contact runner who had two 1,000-yard seasons with the Cardinal and had 11 100-yard-plus games in ’09.

A far more well-rounded athlete than he’s being given credit for, Gerhart was a good enough baseball player to have started for a Stanford team that advanced to the College World Series. He looks like someone’s second-round pick at this point.

Georgia Tech’s Jonathan Dwyer, a 229-pounder, is another big back, but he played in a triple-option attack and has not run well in workouts. Also, because of the offense he played in, he is a bit of a project in terms being a receiver or playing in third-down situations in pass protection.

There are several smaller multitaskers, such as Cal’s Jahvid Best, USC’s Joe McKnight and Mississippi’s Dexter McCluster, but few see those players as having every-down potential.

Oregon’s LeGarrette Blount, who missed most of the 2009 season after being suspended for taking a swing at a Boise State defender following a Ducks loss, has gained some traction with teams because he was 241 pounds at the combine to go with a 4.62 40.

An intriguing player to watch, simply because nobody on the board matched his production in college football, is Wayne (Mich.) State’s Joique Bell. He won the Harlon Hill trophy — the Division II Heisman — in 2009 and finished his career with 6,728 rushing yards including two 2,000-yard seasons.

He’s a meat-and-potatoes runner with no wasted motions. So, teams that favor those no-frills, one-cut runners, such as the Redskins, are going to like him.

He weighed 223 pounds at the Senior Bowl, 220 at the combine, so he has some size. Bell is well worth a draft pick and with the right team could be a nice player.

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